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Publication numberUS1780312 A
Publication typeGrant
Publication dateNov 4, 1930
Filing dateJul 19, 1923
Priority dateJul 19, 1923
Publication numberUS 1780312 A, US 1780312A, US-A-1780312, US1780312 A, US1780312A
InventorsPhelan Louis A M
Original AssigneeTime O Stat Controls Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mounting for electrical switches
US 1780312 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

NOV. 4, 1930. V PHELAN 1,780,312



This invention relates to mountings for electrical switches and more particularly to devices for mounting liquid contactors such as are commonly housed within a container made of glass or other fragile material.

More particularly, this invention embodies a two-part insulating and protective housing for encasing a tiltably operated mercury switch of a type comprising a glass tube having a cooperating pair of spaced electrodes and a movable body of mercury therein for bridging the electrodes when the tube is tilted to a predetermined angle.

One object of my invention is to provide a 'ri 'id means for mounting a mercury switch tu e upon any desired actuating member such for example as a control pedal of a motor vehicle or other machine. More particularly, it is a purpose of this invention to provide such a mounting means which will serve to protect the fragile tube from mechanical injury and at'the same time provide means for the ready attachment of the electrical connections thereto.

rate and rapid positioning in the housing of the tiltable switch and its electrical connections while the switch is still exposed to the view, thus the possibility of cracking the tube or misplacing the connections during the assembly operations is substantially minimized. Furthermore, such procedure enables the tube to be positioned in a definite relation in respect to the outside surfaces of the protective housing and accordingly even when the tube is completely covered by the insulated and protective housing, the lions ing may be accuratelymounted at an angle such that the switch will actuate-after an exact predetermined -change to its inclination.

Another aim of my'invention resides in the provision of a switch mounting of the character described which is susceptible of inexpensive production in large quantities and which is durable and efficient in use and may be readily installed for use under a wide variety 0 conditions.

Further objects will become apparent upon reference to the following description and the appended claims taken in connection with the accompanying drawings, in which Fig. 1 is a perspective view of a cap portion of the switch mounting embodying my invention;

. Fig. 2 is a perspective view of the main body portion of the switch mounting comprising my invention and showing sealed therein a tiltable mercury contactor tube;

Fig. 3 is a cross sectional View taken on a line such as indicated at 3-3 in Fig. 2 and showing the switch mounting in? assembled condition; and i Fig. 4 illustrates the switch mounting applied to a control pedal of a motor vehicle in order to permit actuation of the switch simultaneously with the control of the vehicle, and thus permitting the switch to operate an electrical circuit, as for example a signal circuit.

Referring to Figs. 1 and 2, a hermetically sealed glass tube is indicated at 10 and may contain therein a movable body of conducting fluid, such as mercury 11 which is adapted to move upon the interior surface of the tube into and out of bridging relation with a pair of electrodes 12 and 13 which may be sealed through the glass walls of the tube and externally connected to any desired circuit which is to be controlled by the switch device.

In order to fully protect the contactor tube 10 from mechanical injury and in order to provide a durable and convenient means for supporting this tube, a pair of cooperating insulated housing members 14 and 15 are provided therefor. The members 14 and 15 may be respectively formed with cavities at 16 and 17 each of which serves to enclose approximately one half of the tube 10 which is preferably disposed longitudinally therein.

As appears in Fig. 2, I have provided the housing member 15 with a pair of screws or bolts 18 and 19 which may be fixed to the member 15 in any desirable manner as by their extension through openings 20 and by being provided with nuts 21 for their securement within these openings. The screws 111?. preferably be sealed in place by c v ring th heads thereof with a poured insulated compound as indicated at 22. From the electrodes 12 and 13, a pair of lead wires 23 and 24 may extend to the screws18 and 19 respectlvely and-may be retained thereat beneath nuts as at 21. Suitable openings at 25 and 26 may be provided inthe housing cover member 14 to be engaged by the screws 18 and 19, respectively. After the tube 10 is in place within the housing member 15, the cap member 14 may be placed thereover and retained in position by means of nuts as at 27 upon the screws 18 and 19.

- From the above it will be seen that the screws 18 and 19 serve one important purpose by providing binding posts for attaching the electrical leads to any desired external circuit, the terminals from which, as at 28, may be fixed beneath the nuts 27. The screws 18 and 19 also serve the further purpose of bringing the cooperating halves of the housing into proper registration and of mechanically supporting or retaining these halves in their proper relation. It w1ll thus be seen that the screws conveniently serve a double purpose, thus greatly facilitating the manufacture and assemblage of the device.

As evidenced by Fig. 2, the cap member 14 may be removed to enable inspection of the tube 10 or the connecting wires without in any way disturbing these connections and without removing the tube from its position as lodged within the housing member 15. Accordingly, the tube may be sealed within the member 15 if desired by the use of pitch or other adhesive insulating compound, as

indicated at 29. In this manner the structure insofar as shown in Fig. 2 may. be substantially permanently assembled as a unitary whole before the tube 10 and the connections thereto become concealed by applying the cap member 14. The rapid and correct assembly of the device is thus assured. Furthermore, the tube may be adjusted and fixed in' its proper horizontal position while still in full view.

If the tube is .thus accurately placed in a horizontal position parallel with the longitudinal exterior surfaces of the member 1.5, these surfaces will-serve as guides for accurately mounting the device even after the tube itself is concealed within the members 14 and 15.

The members 14 and. 15, if desired. may be provided with communicating openings 30 and 31 permitting for the insertion of a mounting screw 32, as shown in Fig. 4.

The screw32 -may serve to attach the switch device to any desired actuating means, such as a vehicle control lever 33 move into and out of bridging relation with the switch electrodes, thereby actuating any.

desired form of signal or other mechanism which may be placed in circuit with the switch.

While I have shown and described one.

'ters Patent in the United States, is:

1. A switch device comprising a tiltably operated liquid contactor tube, a housing thereforformed of two cooperating portions of insulating material for enveloping said tube, means fixed to one of said portions for removably attaching the other portion thereto, said means serving as electrical terminals for the electrodes of said tube, and means for fixing the tube rigidly in one of the portions of said housing.

2. A switch device comprising a contactor tube, an insulating housing member therefor formedwith a cavity, means for fixedly securing said contactor tube in said cavity, a removable cap member for covering the face of said housing member and said cavity, and binding screws fixed-in said housing member and electrically connected to the'electrodcs of said contactor tube and extending through said cap member for removably retaining said cap member in contact with said housin member.

3. In com ination with a pivotally mounted brake pedal, of a switch device attached thereto whereby the circuit through said switch is opened and closed byactuating said brake pedal, said switch comprising a fragile container that houses the stationary I e LOUIS A. M. PHELAN.

which is here shown merely as one useful application of the device. mounting may be so adjusted in reference to the control lever that upon the operation of the lever, the body of mercury 11 will The switch for receiving said container, and

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4949228 *May 31, 1988Aug 14, 1990Wu Fu LinBicycle signalling device
U.S. Classification200/61.47, 200/61.89, 139/336, 200/215, 200/183, 200/61.52
International ClassificationH01H29/12, H01H29/00
Cooperative ClassificationH01H29/12
European ClassificationH01H29/12